Upon fighting the ender dragon, when attacked, the ender crystals explode and the fire animation stops, but the crystals remain and still heal the dragon.

I can't seem to be able to reproduce as, when recreating the same environment (Superflat, Void preset, /setblock ~ ~ ~1 end_portal, then destruction of a crystal with a snowball), the bug doesn't reappear. Furthermore, the previously broken crystals disappear upon re-entering the world.